DC vacuum interrupter with multi-polar transverse permanent magnetic structure

ABSTRACT

The present application discloses a DC vacuum interrupter and the application. The cup-shaped contact of the vacuum interrupter is in a transverse magnetic field. The magnetic core is placed in the contact cup. The magnetic core inside the cup of the contact works with the permanent magnets outside the vacuum interrupter to generate transverse magnetic fields in multiple directions between the contacts. While the contacts are open, the arc burns and moves rapidly along the ring shaped contacts under the transverse field along the tangent line of the contacts. While the arc moves rapidly along the ring-shaped contacts, the arc column passes the permanent magnets structure and works with the magnetic core to generate multi-polar transverse magnetic field. While the arc column makes a turn, the number of the transverse fields which are cut by the arc is same with the number of the permanent magnets set.

CROSS REFERENCE OF RELATED APPLICATION

This application claims priority under 35 U.S.C. 119(a-d) to CN2018102439505, filed Mar. 23, 2018.

BACKGROUND OF THE PRESENT INVENTION Field of Invention

The present invention relates to vacuum circuit breaker and DC vacuuminterrupter field, and more particularly to DC vacuum interrupter with amulti-polar transverse permanent magnetic structure and the applicationthereof.

Description of Related Arts

The vacuum interrupter develops rapidly with a wide application in ACtransmission and distribution system. With a development of electriccar, solar power and the mature of the vacuum arc technology, how toapply the vacuum circuit breaker to DC field becomes a huge challengeand forms a huge demand.

There are two types of vacuum arc technology in the conventional vacuumcircuit breaker application in AC system, which are TMF (transversemagnetic field) and AMF (axial magnetic field). The TMF inducestransverse magnetic field vertical to the arc current flow in a gapbetween the contacts when the current passes the contacts with specialstructure. The arc spins rapidly on the contacts under the force, whichavoid an intense burning on the contacts and enables an evenly burningof the arc on the contacts to improve the on/off capability of theswitch. The AMF induces axial magnetic field parallel to the arc currentflow in a gap between the contacts when the current passes the contactswith special structure. The axial magnetic field is capable of suppressa collection of arcs on the negative and positive pole under highcurrent, which reduces a burning of the contacts and improves the on/offcapability of the switch.

Research shows that the vacuum arc voltage increases significantly whena high frequency transverse filed is put on the transverse of thevertical arc current flow while the arc is burning. Conventionally, therange of the vacuum arc voltage under the force of axial magneticcontact is 20-60V and the range of vacuum arc voltage under the force oftransverse magnetic contacts is 50-100V. Compared with the gas arc,especially hydrogen arc, the voltage of the electric vacuum arc is low.High arc voltage is required in DC current and special situation to turnon or off of the current. The vacuum interrupter with the conventionalcontact and the voltage feature of the vacuum arc are incapable ofmeeting the requirements. A lot of research and experiments shows thatthe arc voltage of the vacuum arc can be increased by 40% to 80% under ahigh frequency transverse magnetic field besides there are still hugespace for further improvement.

To put high frequency transverse magnetic field on the vacuum arc israther easy in a lab except for the structure is too complicate.Helmholtz coils of the transverse magnetic field are generated on onehand, the high frequency current which enables the Helmholtz coils togenerate the magnetic field is required on the other hand. The method islimited in the lab and keeps from application in the industrial fielddue to the over-complicate structure and power circuit, though themethod meets the predicted requirement of the design.

SUMMARY OF THE PRESENT INVENTION

In order to solve the problem of the conventional technology, thepresent invention provides a DC vacuum interrupter with multi-polartransverse permanent magnetic structure and the application thereof. Thepermanent magnet sets and the magnetic core inside the contact cupcoordinate together based on the cup-shaped transverse magnetic fieldcontact to solve the problem of over-complicate of the envelopestructure for realizing high-frequency transverse magnetic field duringthe arc burning. The present invention provides a vacuum interrupterwith high arc voltage under high frequency transverse magnetic field,which has a good perspective to be applied in industrial field and isable to be applied in high arc voltage circuit. The present invention isbased on research and experiments.

In order to achieve the goal, the present invention adopts the belowtechnical solution:

A DC vacuum interrupter with a permanent magnetic structure, comprises:a ceramic envelope (122), a permanent magnetic structure 201 at a fixedside outside of the ceramic envelope (122), a permanent magneticstructure 202 at a moving side outside of the ceramic envelope (122), amulti-polar magnetic core structure 103 at the fixed side inside of theceramic envelope (122), a multi-polar magnetic core structure (106) atthe moving side inside of the ceramic envelope (122), a cup-shapedtransverse magnetic contact (102) at the fixed side and a cup-shapedtransverse magnetic contact (107) at the moving side, wherein amulti-polar transverse magnetic field is generated in a gap between thecup-shaped transverse magnetic contact (102) at the fixed side and thecup-shaped transverse magnetic contact (107) at the moving side by thepermanent magnetic structure (201) at the fixed side and the permanentmagnetic structure at the moving side and the multi-polar magnetic corestructure (103) at the fixed side and the multi-polar magnetic corestructure 106 at the moving side; when an arc goes around a ring contactmaterial (104) at the fixed side and a ring contact material (105) atthe moving side in the gap, the arc cuts magnetic field lines of atransverse magnetic field generated by the permanent magnetic structure(201) and the permanent magnetic structure (202) and the multi-polarmagnetic core structure (103) and the multi-polar magnetic corestructure (106); an arc column moves rapidly between the gap under amagnetic force generated by the cup-shaped transverse magnetic contact(102) at the fixed side and the cup-shaped transverse magnetic contact(107) at the moving side during a high current arc-melting procedure;thus the transverse magnetic field generated by the permanent magneticstructure (201) at the fixed side and the permanent magnetic structure(202) at the moving side and the multi-polar magnetic core structure(103) at the fixed side and the multi-polar magnetic core structure(106) at the moving side acts on the arc for multiple times during thehigh current arc-melting procedure. The excitation system of thepermanent magnet of the vacuum interrupter acts similar to the highfrequency transverse magnetic field, which increases the arc voltagesignificantly.

Research shows that the vacuum arc goes around the ring contact in 2 mswhile the arc burning of the high current cup-shaped transverse magneticfield contact. If the transverse permanent magnets set has six poles,the vacuum arc passes each of the poles in 0.33 ms, which equals to a3000 Hz transverse magnetic field acting on the vacuum arc. Consideringthe spinning speed of the arc column during the arc burning is in waves,the frequency of the transverse magnetic field of the vacuum arc isequivalent to above 1000 Hz. Thus, the present invention acts similar tothe high frequency transverse magnetic field generated by the Helmholtzcoil outside of the vacuum interrupter under the coordination of thepermanent magnet set and the magnetic core inside the contact cup.

The detailed design is as follow:

The DC vacuum interrupter comprises a fixed side structure and a movingside structure;

wherein the fixed side structure further comprises a conducting rod(101) at the fixed side, an end cap (121) at the fixed side which iswelded on a top of the conducting rod (101); a ceramic envelope (122) iswelded on edges of the end cap (121); the cup-shaped transverse magneticcontact (102) at the fixed side is welded on the bottom of theconducting rod (101); the ring contact material (104) at the fixed sideis welded on a bottom of the cup-shaped transverse magnetic contact(102); the multi-polar magnetic core structure (103) is welded on thebottom of the ring contact material (104) at the fixed side; a weldingsurface of the ring contact material (104) is more protruding than anouter surface of the multi-polar magnetic core structure (103); thepermanent magnetic structure (201) is placed around the ceramic envelope(122) within a height of the multi-polar magnetic core structure 103;the permanent magnetic structure (201) further comprises a permanentmagnetic supporting ring (109) and multiple permanent magnetic sets(110) which are inserted evenly around the permanent magnetic supportingring (109);

wherein the moving side structure further comprises a conducting rod(108) at the moving side; the cup-shaped transverse magnetic contact(107) is welded on the top of the conducting rod 108 at the moving side;the ring contact material (105) at the moving side is welded on the topof the cup-shaped transverse magnetic contact (107); the multi-polarmagnetic core structure (106) at the moving side is welded on the bottomof the cup-shaped transverse magnetic contact (107); a welding surfaceof the ring contact material (105) is more protruding than an outersurface of the multi-polar magnetic core structure (106); the permanentmagnetic structure (202) is placed around the ceramic envelope (122);the permanent magnetic structure (202) further comprises a permanentmagnetic supporting ring (112) and multiple permanent magnetic sets(111) which are inserted evenly around the permanent magnetic supportingring (112); a vacuum bellow connector (123) is welded on the bottom ofthe conducting rod (108); a vacuum bellow (124) is welded on the bottomof the vacuum bellow connector (123); an moving side end cap (125) iswelded on the bottom of the vacuum bellow (124);

poles of the multi-polar magnetic core structure (103) is the same aspermanent magnetic poles of the multiple permanent magnetic sets (110)in the permanent magnetic structure (201); the number of the poles isnot less than two; the angle of each pole of the multi-polar magneticcore structure (103) is same with the angle of each permanent magnet ofthe permanent magnetic structure (201), a north pole and a south pole ofeach permanent magnet in the multiple permanent magnetic sets (110) ofthe permanent magnetic structure (201) are in a same direction with anorth pole and a south pole of the multi-polar magnetic core structure(103); the north pole or the south pole of each permanent magnet in themultiple permanent magnetic sets (110) is direct to the vacuuminterrupter; the north pole and the south pole of neighboring permanentmagnets in the multiple permanent magnetic sets (110) are in a same ordifferent direction; a height of the permanent magnetic structure (201)is same with the height of the multi-polar magnetic core structure(103), or different with the height of the multi-polar magnetic corestructure (103) according to needs of magnetic fields control.

poles of the multi-polar magnetic core structure (106) is the same aspermanent magnetic poles of the multiple permanent magnetic sets (111)in the permanent magnetic structure (202); the number of poles is notless than two; the angle of each pole of the multi-polar magnetic corestructure (106) is same with the angle of each permanent magnet of thepermanent magnetic structure (202), a north pole and a south pole ofeach permanent magnet in the multiple permanent magnetic sets (111) ofthe permanent magnetic structure (202) are in a same direction with anorth pole and a south pole of the multi-polar magnetic core structure(106); the north pole or the south pole of each of the permanent magnetsin the multiple permanent magnetic sets (111) is direct to the vacuuminterrupter; the north pole and the south pole of neighboring permanentmagnets in the multiple permanent magnetic sets (111) are in a same ordifferent direction; a height of the permanent magnetic structure (202)is same with the height of the multi-polar magnetic core structure(106), or different with the height of the multi-polar magnetic corestructure 106 according to the needs of magnetic fields control.

In the permanent magnetic structure (201) and the permanent magneticstructure (202), a distance of end surfaces of the permanent magnet inthe permanent magnetic sets 111 and the permanent magnetic sets (110) tocorresponding end surfaces of the multi-polar magnetic core structure(103) and the multi-polar magnetic core structure (106) is less thanthree times of a length of the permanent magnets respectively.

The permanent magnetic structure (201) and the permanent magneticstructure 201 are independent at fixed side and moving side or closetogether as a whole with corresponding a permanent magnet supportingring and a permanent magnet set.

A vacuum circuit breaker comprises the DC vacuum interrupter describedabove.

A DC vacuum interrupter with a multi-polar transverse permanent magneticstructure, comprises a ceramic envelope (122), a permanent magneticstructure (201) at a fixed side outside of the ceramic envelope (122), apermanent magnetic structure 202 at a moving side outside of the ceramicenvelope (122), a multi-polar magnetic core structure (103) at the fixedside inside of the ceramic envelope (122), a multi-polar magnetic corestructure (106) at the moving side inside of the ceramic envelope (122),a cup-shaped transverse magnetic contact (102) at the fixed side and acup-shaped transverse magnetic contact (107) at the moving side, whereina multi-polar transverse magnetic field is generated in a gap betweenthe cup-shaped transverse magnetic contact (102) at the fixed side andthe cup-shaped transverse magnetic contact (107) at the moving side bythe permanent magnetic structure (201) at the fixed side and thepermanent magnetic structure at the moving side and the multi-polarmagnetic core structure (103) at the fixed side and the multi-polarmagnetic core structure (106) at the moving side; when an arc goesaround a ring contact material (104) at the fixed side and a ringcontact material (105) at the moving side in the gap, the arc cutsmagnetic field lines of a transverse magnetic field generated by thepermanent magnetic structure (201) and the permanent magnetic structure(202) and the multi-polar magnetic core structure (103) and themulti-polar magnetic core structure (106); an arc column moves rapidlybetween the gap under a magnetic force generated by the cup-shapedtransverse magnetic contact (102) at the fixed side and the cup-shapedtransverse magnetic contact (107) at the moving side during a highcurrent arc-melting procedure; thus the transverse magnetic fieldgenerated by the permanent magnetic structure (201) at the fixed sideand the permanent magnetic structure (202) at the moving side and themulti-polar magnetic core structure (103) at the fixed side and themulti-polar magnetic core structure (106) at the moving side acts on thearc for multiple times during the high current arc-melting procedure.The excitation system of the permanent magnet of the vacuum interrupteracts similar to the high frequency transverse magnetic field, whichincreases the arc voltage significantly. The present invention achievesthe goal of DC breaking and is able to be applied in situation needshigh arc voltage. The present invention takes the effects of the highfrequency transverse magnetic field on the vacuum arc voltage intoaccount and takes full advantages of the high speed circle movement ofthe vacuum arc during arc burning. The present invention further bringsabout a delicate magnetic circuit design of the transverse magneticfield and successfully realizes a multi-polar design of the transversemagnetic field by the multi-polar permanent magnets. The presentinvention increases the vacuum arc voltage and promotes the applicationsin DC on/off in the vacuum circuit breaker which adopts the vacuuminterrupter.

The present invention has the following advantages comparing with theconventional technology.

1) High frequency transverse magnetic field is put on the vacuum arc.The present invention takes advantage of the arc turning around rapidlyon the surface of the contact and successfully improves arc voltage ofthe vacuum interrupter. The vacuum breaker in DC circuit adopts thevacuum interrupter in the present invention is possible.

2) The present invention designs magnetic circuit of transverse magneticand realizes multi-polar transverse magnetic field through multi-polarpermanent magnets. The present invention does not require complicateHelmholtz coils and complicated power supply system with excitationcurrent.

3) The present invention is simple in structure with low fault rate andis able to promote a wide application of the vacuum interrupter inindustrial filed.

4) The strength of transverse magnetic field between the gap of theconventional contacts rapidly attenuates with the widening of the gap,which limit the application of the contacts with transverse magneticfield in high voltage situations.

The present invention generates a rather strong magnetic field betweenthe gap of the contacts by the permanent magnets structure, which isable to be applied the vacuum interrupter in a circuit with highervoltage.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross-section view along the axial of a DC vacuuminterrupter contacts and a permanent magnets excitation structure of afour-polar transverse permanent magnets structure of the presentinvention of a multi-polar DC vacuum interrupter with a transversepermanent magnets structure.

FIG. 2 is a side view the DC vacuum interrupter contacts and a permanentmagnets excitation structure of the four-polar transverse permanentmagnets structure of the present invention of a multi-polar DC vacuuminterrupter with the transverse permanent magnets structure.

FIGS. 3a and 3b are relative position and radial section view of the DCon/off vacuum interrupter contacts and a permanent magnets excitationstructure of the four-polar transverse permanent magnets structure ofthe present invention of a multi-polar DC vacuum interrupter with thetransverse permanent magnets structure.

FIG. 4a is the relative position of the N-pole and the S-pole of one ofthe permanent magnetic set of the DC vacuum interrupter contacts and apermanent magnets excitation structure of the four-polar transversepermanent magnets structure of the present invention of a multi-polar DCvacuum interrupter with the transverse permanent magnets structure. AndFIG. 4b is the relative position of another set of the permanent magnet.

FIGS. 5a, 5b and 5c are the perspective view of the relative position ofthe transverse permanent magnetic structure and the contacts offour-polar, six-polar and eight-polar DC vacuum interrupter of thepresent invention of a multi-polar DC vacuum interrupter with thetransverse permanent magnets structure.

FIGS. 6a and 6b are the relative position of the N-pole and S-pole ofthe transverse magnets of the four-polar and six-polar of the presentinvention of a multi-polar DC vacuum interrupter with the transversepermanent magnets structure.

FIG. 7 is a section-view of the four-polar transverse permanent magnetstructure DC vacuum interrupter of the present invention of amulti-polar DC vacuum interrupter with the transverse permanent magnetsstructure.

FIG. 8 is a side-view of the four-polar transverse permanent magnetstructure DC vacuum interrupter of the present invention of amulti-polar DC vacuum interrupter with the transverse permanent magnetsstructure.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to the drawings, the present invention is described in detailwith the embodiments.

FIG. 1 and FIG. 2 are a cross-section view along the axial and the sideview of a DC vacuum interrupter contacts and a permanent magneticexcitation structure of a four-polar transverse permanent magneticstructure of the present invention of a multi-polar DC vacuuminterrupter with a transverse permanent magnetic structure. As shown inthe FIG. 1 and FIG. 2 the fixed side structure further comprises aconducting rod 101, wherein the cup-shaped transverse magnetic contact102 at the fixed side is welded on the bottom of the conducting rod 101;the ring contact material 104 at the fixed side is welded on the bottomof the cup-shaped transverse magnetic contact 102; the multi-polarmagnetic core structure 103 is welded on the inner bottom of thecup-shaped transverse magnetic contact 102 of the fixed side; thewelding surface of the ring contact material 104 is more protruding thanan outer surface of the multi-polar magnetic core structure 103; thepermanent magnetic structure 201 is placed around the ceramic shielding122 within a height of the multi-polar magnetic core structure 103; thepermanent magnetic structure 201 further comprises a permanent magneticsupporting ring 109 and multiple permanent magnetic sets 110.

As shown in FIG. 1 and FIG. 2, the moving side structure furthercomprises a conducting rod 108 at the moving side; the cup-shapedtransverse magnetic contact 107 is welded on a top of the conducting rod108 at the moving side; the ring contact material 105 at the moving sideis welded on a top of the cup-shaped transverse magnetic contact 107;the multi-polar magnetic core structure 106 at the moving side is weldedon the inner bottom of the cup-shaped transverse magnetic contact 107;the welding surface of the ring contact material 105 is more protrudingthan an outer surface of the multi-polar magnetic core structure 106;the permanent magnetic structure 202 is placed around the ceramicshielding 122; the permanent magnetic structure 202 further comprises apermanent magnetic supporting ring 112 and multiple permanent magneticsets 111.

The fixed side permanent magnet set 110 and the moving side permanentmagnet set 111 comprise four permanent magnets respectively which areevenly distributed along the circle of the permanent magnetic supportingring 109 and the permanent magnetic supporting ring 112.

FIGS. 3a and 3b are relative position and radial section view of the DCvacuum interrupter contacts and a permanent magnets excitation structureof the four-polar transverse permanent magnets structure of the presentinvention of a multi-polar DC vacuum interrupter with the transversepermanent magnetic structure. The moving side permanent magnet set 111comprises four permanent magnets which are evenly distributed along thecircle of the permanent magnetic supporting ring 112 and point to thefour poles of the multi-polar magnetic core structure 106 inside thecup-shaped transverse magnetic contact 107. The distance between the endsurface of the of the moving side permanent magnet set 111 to thesurface of corresponding pole of multi-polar magnetic core structure 106is l; the length of the permanent magnet is g, l varied in a range of 0to 3 g.

FIGS. 4a and 4b are the relative position of the N-pole and the S-poleof one of the permanent magnetic set of the DC vacuum interruptercontacts and a permanent magnetic excitation structure of the four-polartransverse permanent magnetic structure of the present invention of amulti-polar DC vacuum interrupter with the transverse permanent magneticstructure. As shown in FIGS. 4a and 4b , the direction of the N-polar ofS-polar is same with the N-polar and S-polar with a 180 degreedifference in the permanent magnetic structure 201 and permanentmagnetic structure 202.

FIGS. 5a, 5b and 5c are the perspective view of the relative position ofthe transverse permanent magnetic structure and the contacts offour-polar, six-polar and eight-polar DC vacuum interrupter of thepresent invention of a multi-polar DC vacuum interrupter with thetransverse permanent magnetic structure. The poles of the multi-polarmagnetic core structure 106 is same with the poles of the permanentmagnet in the permanent magnetic structure 202. The angle of the polesof the multi-polar magnetic core structure 106 is same with the poles ofthe permanent magnet in the permanent magnetic structure 202.

FIGS. 6a and 6b is the relative position of the N-pole and S-pole of thetransverse magnets of the four-polar and six-polar of the presentinvention of a multi-polar DC vacuum interrupter with the transversepermanent magnetic structure. The direction of the N-polar of S-polar ofthe permanent magnets is same with the N-polar and S-polar with a 180degree difference in the permanent magnet set 111. Both the N-polar andS-polar of the permanent magnets in the permanent magnet set 111 areallowed to point to the vacuum interrupter side. The neighboring N-polarand S-polar are capable to point to the same or different direction.

FIG. 7 is a section-view of the four-polar transverse permanent magneticstructure DC vacuum interrupter of the present invention of amulti-polar DC vacuum interrupter with the transverse permanent magneticstructure. As shown in FIG. 7, the fixed side structure furthercomprises a conducting rod 101 at the fixed side, the cup-shapedtransverse magnetic contact 102 at the fixed side is welded on thebottom of the conducting rod 101; the ring contact material 104 at thefixed side is welded on the bottom of the cup-shaped transverse magneticcontact 102; the multi-polar magnetic core structure 103 is welded onthe inner bottom of the cup-shaped transverse magnetic contact 102 atthe fixed side; a welding surface of the ring contact material 104 ismore protruding than an outer surface of the multi-polar magnetic corestructure 103; the permanent magnetic structure 201 is placed around theceramic shielding 122 within a height of the multi-polar magnetic corestructure 103; the permanent magnetic structure 201 further comprises apermanent magnetic supporting ring 109 and multiple permanent magneticsets 110. An end cap 121 at the fixed side is welded on the top of theconducting rod 101. A ceramic shielding 122 is welded on the edge of theend cap 121. The moving side structure further comprises a conductingrod 108 at the moving side; the cup-shaped transverse magnetic contact107 is welded on a top of the conducting rod 108 at the moving side; thering contact material 105 at the moving side is welded on the top of thecup-shaped transverse magnetic contact 107; the multi-polar magneticcore structure 106 at the moving side is welded on the inner bottom ofthe cup-shaped transverse magnetic contact 107; a welding surface of thering contact material 105 is more protruding than an outer surface ofthe multi-polar magnetic core structure 106; the permanent magneticstructure 202 is placed around the ceramic shielding 122; the permanentmagnetic structure 202 further comprises a permanent magnetic supportingring 112 and multiple permanent magnetic sets 111; a vacuum bellowconnector 123 is welded on the bottom of the conducting rod 108; avacuum bellow 124 is welded on the bottom of the vacuum bellow connector123; an moving side end cap 125 is welded on a bottom of the vacuumbellow 124;

FIG. 8 is a side-view of the four-polar transverse permanent magneticstructure DC vacuum interrupter of the present invention of amulti-polar DC vacuum interrupter with the transverse permanent magneticstructure. As shown in the FIG. 8, there are two sets of permanentmagnetic structure in the gap between the contacts outside of theceramic shielding, which are the permanent magnetic structure 201 andthe permanent magnetic structure 202. The permanent magnet set of thepermanent magnetic structure 201 comprises four permanent magnets whichare evenly distributed along the circle of the permanent magneticsupporting ring 109. The permanent magnetic structure 202 is similar tothe permanent magnetic structure 201. The difference in the height ofthe permanent magnetic structure 201 and the permanent magneticstructure 202 with the height of the multi-polar magnetic core structure103 and the multi-polar magnetic core structure 106 is less than threetimes of the gap between the contacts.

One skilled in the art will understand that the embodiment of thepresent invention as shown in the drawings and described above isexemplary only and not intended to be limited. Any modification andalteration of the DC vacuum interrupter with multi-polar transversepermanent magnetic structure and the applications thereof are within theprotection range of the present invention.

What is claimed is:
 1. A DC (Direct Current) vacuum interrupter with amulti-polar transverse permanent magnetic structure, comprising: aceramic envelope (122), a first permanent magnetic structure (201) at afixed side outside of the ceramic envelope (122), a second permanentmagnetic structure (202) at a moving side outside of the ceramicenvelope (122), a first multi-polar magnetic core structure (103) at thefixed side inside of the ceramic envelope (122), a second multi-polarmagnetic core structure (106) at the moving side inside of the ceramicenvelope (122), a first cup-shaped transverse magnetic contact (102) atthe fixed side and a second cup-shaped transverse magnetic contact (107)at the moving side, wherein a multi-polar transverse magnetic field isgenerated in a gap between the first cup-shaped transverse magneticcontact (102) at the fixed side and the second cup-shaped transversemagnetic contact (107) at the moving side by the first permanentmagnetic structure (201) at the fixed side and the permanent magneticstructure at the moving side and the first multi-polar magnetic corestructure (103) at the fixed side and the second multi-polar magneticcore structure (106) at the moving side; when an arc goes around a firstring contact material (104) at the fixed side and a second ring contactmaterial (105) at the moving side in the gap, the arc cuts magneticfield lines of a transverse magnetic field generated by the firstpermanent magnetic structure (201) and the second permanent magneticstructure (202) and the first multi-polar magnetic core structure (103)and the second multi-polar magnetic core structure (106); an arc columnmoves rapidly between the gap under a magnetic force generated by thefirst cup-shaped transverse magnetic contact (102) at the fixed side andthe second cup-shaped transverse magnetic contact (107) at the movingside during a high current arc-melting procedure; thus the transversemagnetic field generated by the first permanent magnetic structure (201)at the fixed side and the second permanent magnetic structure (202) atthe moving side and the first multi-polar magnetic core structure (103)at the fixed side and the second multi-polar magnetic core structure(106) at the moving side acts on the arc for multiple times during thehigh current arc-melting procedure.
 2. The DC vacuum interrupter, asrecited in claim 1, further comprising a fixed side structure and amoving side structure; wherein the fixed side structure furthercomprises a first conducting rod (101) at the fixed side, an end cap(121) at the fixed side which is welded on a top of the conducting rod(101); the ceramic shielding (122) is welded on edges of the end cap(121); the first cup-shaped transverse magnetic contact (102) at thefixed side is welded on a bottom of the first conducting rod (101); thefirst ring contact material (104) at the fixed side is welded on abottom of the first cup-shaped transverse magnetic contact (102); thefirst multi-polar magnetic core structure (103) is welded on an innerbottom of the first ring contact material (104) at the fixed side; awelding surface of the first ring contact material (104) is moreprotruding than an surface of the first multi-polar magnetic corestructure (103); the first permanent magnetic structure (201) is placedaround the ceramic envelope (122) within a height of the firstmulti-polar magnetic core structure (103); the first permanent magneticstructure (201) further comprises a first permanent magnetic supportingring (109) and a first multiple permanent magnetic sets (110) which areinserted evenly around the permanent magnetic supporting ring (109);wherein the moving side structure further comprises a second conductingrod (108) at the moving side; the second cup-shaped transverse magneticcontact (107) is welded on a top of the second conducting rod (108) atthe moving side; the second ring contact material (105) at the movingside is welded on a top of the second cup-shaped transverse magneticcontact (107); the second multi-polar magnetic core structure (106) atthe moving side is welded on the inner bottom of the second cup-shapedtransverse magnetic contact (107); a welding surface of the second ringcontact material (105) is more protruding than a surface of the secondmulti-polar magnetic core structure (106); the second permanent magneticstructure (202) is placed around the ceramic shielding (122); the secondpermanent magnetic structure (202) further comprises a second permanentmagnetic supporting ring (112) and a second multiple permanent magneticsets (111) which are inserted evenly around the second permanentmagnetic supporting ring (112); a vacuum bellow connector (123) iswelded on a bottom of the second conducting rod (108); a vacuum bellow(124) is welded on a bottom of the vacuum bellow connector (123); anmoving side end cap (125) is welded on a bottom of the vacuum bellow(124); poles of the first multi-polar magnetic core structure (103) issame with a first batch of permanent magnetic poles of the firstmultiple permanent magnetic sets (110) in the first permanent magneticstructure (201); a number of the poles is not less than two; an angle ofeach pole of the first multi-polar magnetic core structure (103) is samewith an angle of each permanent magnets of the first permanent magneticstructure (201), a north pole and a south pole of each of the firstpermanent magnets in the first multiple permanent magnetic sets (110) ofthe first permanent magnetic structure (201) are in a same directionwith a north pole and a south pole of the first multi-polar magneticcore structure (103); the north pole or the south pole of each of thepermanent magnets in the first multiple permanent magnetic sets (110) isdirect to the vacuum interrupter; the north pole and the south pole ofneighboring permanent magnets in the first multiple permanent magneticsets (110) are in a same or different direction; a height of the firstpermanent magnetic structure (201) is same with the height of the firstmulti-polar magnetic core structure (103), or different with the heightof the first multi-polar magnetic core structure (103) according toneeds of magnetic fields control; poles of the second multi-polarmagnetic core structure (106) is same with a second batch of permanentmagnetic poles of the second multiple permanent magnetic sets (111) inthe second permanent magnetic structure (202); a number of the poles isnot less than two; an angle of each of the poles of the secondmulti-polar magnetic core structure (106) is same with an angle of eachof permanent magnets of the second permanent magnetic structure (202), anorth pole and a south pole of each of the permanent magnets in thesecond multiple permanent magnetic sets (111) of the second permanentmagnetic structure (202) are in a same direction with a north pole and asouth pole of the second multi-polar magnetic core structure (106); thenorth pole or the south pole of each of the permanent magnets in thesecond multiple permanent magnetic sets (111) is direct to the vacuuminterrupter; the north pole and the south pole of neighboring permanentmagnets in the second multiple permanent magnetic sets (111) are in asame or a different direction; a height of the second permanent magneticstructure (202) is same with the height of the second multi-polarmagnetic core structure (106), or different with the height of thesecond multi-polar magnetic core structure (106) according to the needsof magnetic fields control.
 3. In the DC vacuum interrupter as recitedin claim 2, wherein a distance of end surfaces of the permanent magnetsin the second multiple permanent magnetic sets (111) and the firstmultiple permanent magnetic sets (110) to corresponding end surfaces ofthe first multi-polar magnetic core structure (103) and the secondmulti-polar magnetic core structure (106) is less than three times of alength of the permanent magnets respectively.
 4. In the DC vacuuminterrupter as recited in claim 1, wherein the first permanent magneticstructure (201) and the second permanent magnetic structure (202) areindependent or close together as a whole with corresponding a permanentmagnet supporting ring and a permanent magnet set.
 5. A vacuum circuitbreaker, wherein a vacuum circuit breaker, comprises a DC vacuuminterrupter described in claim 1 to claim 4.